Crank-axle lathe.



No. 836,360. PATENTED NOV. 20, 1906. J. L. BOGERT.

CRANK AXLE LATHE.

APPLICATION FILED SEPT.9.1004.

s SHEETS-SHEET] u us 1 1 l'oz' No. 886.360. PATENTED NOV. 20, 1906. J.L. BOGERT.

CRANK AXLE LATHE...

APPLICATION FILED SE PT. 9, L904.

3 SHEETS-SHEET 2.

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CRANK AXLE LATHE. APPLICATION FILED SEPT. 9'. 1904 a SHEETS-SHEET s! @Xl- 11413 60 0 l 6%K JZEIya/ 1 144 4 n (CJHUCHIOL/ JOHN L. BOGEBT, OF NEWYORK, N. Y.

' CRANK-ZAXLE LATHE.

Specification of Letters Patent. Application filed September 9, 1904.Serial No. 223.904..

Patented Nov. 20, 1906.

To all whom it may concern:

Be it known that 1, JOHN L. Boomer, a citizen of the United States, anda resident of New York city, borough of Queens, State of New York, haveinvented certain new and useful Improvements in Crank-Axle Lathes, ofwhich the following is a specification.

In United States Letters Patent No. 568,063, granted to me September 22,1896, I have shown a lathe in which the crank-pin and the main portionsof the crank axle or shaft may be readily turned or cut by shifting theposition of the pin or shaft-bearings with respect to the axial line ofthe headstock spindle.

My present invention relates to the class of machines shown in my saidpatent and provides means whereby a pluralityof crankpins or a pluralityof bearing-surfaces of a multiple-throw crank axle or shaft may besimultaneously turned or milled and wherein by 'a simple adjustment ofthe crank-shaft one or the other set of pins or the main shaftbearingsmay be adjusted in alinement with the head-stock spindles. 1

-In carrying out my invention I provide two head-stocks, each having aspindle with gearing connecting said spindles so that they will rotatein absolute synchronism, and I provide each h ad-stock with a chuckadapted to gras th end of a crank-shaft either eccentrical so that thecrank-pins may be brought intov alinement with the axes of ro- 'tationof th'head-stock spindles or concentrically with such s indles, so thatthe main bearin s of the sha t maybe alined with the axes o rotation ofsaid spindles, and I also provide two carriages fitted on the ways ofthe bed for adjustment alongthe same.

Each carriage is provided with two crossslides, gearing being providedfor simultaneously causing the cross-slides of each carriage to be fedtoward each other, whereby two tools may be caused to operatesimultaneously on a crank-pin ormain bearing-sun" pins orbearingsurfaces thereby being simultaneously turned or cut, or, ashereinafter shown, one cross-slide of a pair may carry a tool or milland the corresponding an opposed thrust-bearing or supporting-surface toresist the transverse strain on the work. By thus having two carria eseach provided with two cross-slides, eac crossslide being capable ofcarrying one or more tools and both ends of the shaft being driven,

cross-slide of suchpair may carry is possible to remove twice as muchmetal in the same space of time as can be done with a single carriageandsingle cross-slide thereon as 111 my said patent, whereby economy 1D.turning the crank-pins and bearmg-surfaces effected.

means for holding the ends of crank-shafts upon the head-stock spindles,whereby the position of the shaft or axle to be turned with respectto'the axial line of the headstock spindles may be quickly andaccurately adjusted without removing the crank axle or shaft from thehead-stock chucks.

My invention further comprises the novel details of improvement thatwill be more fully hereinafter set forth and then pointed out in theclaims.

Reference is tobe had to the accompanying drawings, forming part hereof,wherein- .Figure 1 is a side elevation, partly in section, of acrank-axle lathe embodying my invention. Fig. 2 is an enlarged detailface view of the head-stock chuck. Fig. 3 is an edge view thereoflooking from the left in Fig. 2. Fig. 4 is a vertical cross-sectionthrough the head-stock, substantially on the line 4 4 in Fig. 1. Fi 5 isacross-section, part being removed, t rough the main bed and head-stockon the line 5 5 in Fig. 1. Fig. 6 is an enlarged detail section throughthe end of the main driving-shaft and headstock. Fig. 7 is a verticalcross-section, substantially on the line 7 7 in Fig. 1, looking in thedirection of the arrows; and Fig. 8 is a plan view of apair ofcross-slides on a carriage, corresponding to that shown in Fig. 7.Similar numerals of reference indicate corres onding parts in theseveral views.

'i he numeral 1 indicates the main bed of the machine, and 2 representsthe ways, which may be of any well-known construction.

ways 2 and similarly constructed, exceptin that head-stock 3 is adaptedto be adjuste alon the wa s, while head-stock 3 will preferabIy be heidfixed by means of bolts 2 in well-known manner.

said head-stocks are to be rotated in absolute synchronism, and for thispurpose they are provided with gear-Wheels 5 5, that mesh with pinions 66, driven by main shaft 7, mounted in bearings in the main bed, andprovided with pulleys 8 in well-known man- 3 3 are two head-stocksmounted upon The spindles 4. 4? of on multiplethiow crank axles orshafts is.

In this invention I also provide improved v ner. As the head-stock 3 isadjustable along the ways 2, I provide the pinion 6 with a hub 6",adapted to slide along shaft 7, a key 9 connecting the pinion and shaft,and at 10 is 5 a locking-nut on the hub 6", bearing against a shoulder11 on the head-stock. To keep the ends of the head-stocks from risingfrom the bed and to compensate for wear, I provide a bearing for each ofthe pinions 6 and 6 IO as follows: A semicircular bearing-surface 12 onthe head-stock receives the hub 6 and a ea or yoke 13 incloses the lowerportion of hu 6* and hears at its edges 12 against ways 14 on bed 1,bolts 15 locking the caps 13 in r 5 place and holding the surface 12 and14 in rm position. Thus as wear takes place Within the bearing of shaft7 on hub 6 and along the surface 14 the wear may be taken up by the cap13 and bolts 15, and thus proper alinement of the head-stock is provided and the end of the head-stock is kept from rising. At the oppositeend of the head-stock I provide a bearing 16, through which shaft 7freely passes, (see Fig. 5,) 2 5 which bearing is secured 'to thehead-stock by screws or bolts 17 and is provided with guiding-flanges18, which engage ways .14 on bed 1 and prevent the head-stock fromrising.

As head-stock 3 is adjustable, the bolts 17 may be carried up inconvenient position for access, as at the right in Fig. 1.

The spindles 4 4 of the head-stocks are provided with means for grippingthe ends of the crank-shaft 20 for holding said ends 3 5 eitherconcentric with the axes of said s indles or eccentric thereto adistance equa to the eccentricity ofthe axial line of the crankpins 20to be turned. In the arrangement illustrated the spindles 4 4 have hubs4 to 0 which chuck members 21 are eccentricall connected and adapted tofirmly hold the ends of shaft 20. As shown, the member 21 is detachablyconnected with the hub 4 and for this purpose I provide a plate 22,having a recess in one face to receive the hub 4 to revent lateraldisplacement of plate 22, (see ig. 1,) and the chuck member 21 ispivotally supported upon plate 22, as by. a' bolt 23. The member 21 hasa jaw comprising a semi- 5o circular part 21 and a removable part 21*,

held together by jaw that is bored or shaped to receive the end of shaft20 and adapted to firmly grasp the a same, as at 21. The bore 21 is inone posiq 5 tion located concentrically with respect to the axes .ofrotation of spindles 4 4*; but by moving the member 21 on its pivotalpoint .23 the bore 21 may be adjusted to a position eccentric to theaxis of the spindle and on a radius described around the axis of pivot23.

By this means the members 21 may be adjusted laterally, so that the mainpart, of shaft 20 may be sufficiently eccentric to the axes of thespindles to bring the axis of rota- 6 5 tion of the pins 20 to be turnedin alinement bolts 24, forming a chuck-' ceive a pin, which holes ma beat certain distances apart, whereby to indicate readily the amount ofeccentricity. of the bore 21of member 21 when the same is adjusted.Parts 4 and 22 may be detachably held together by bolts 22 anddowel-pins 22".

From the foregoing it will e understood that when the ends of shaft 20are secured in the bores 21 of members 21 and adjusted to a positionconcentric with the axes of rotation of spindles 4 and 4 the mainbearing parts of the crank-axle or shaft 20 will be in position .to beturned, and that when the members 21 are moved sidewise until the theaxes of crank-pins 20 are brought into alinement with'the spindles 4 4said crankpins will be in the proper position for turning their surfacesto the desired diameters, and this without removing the shaft from itschucks. So far, however, as my improvements in the means I have shownfor causing the tools to cut the crank-pins and shaftbearings areconcerned the ends of the shaft may be connected with the spindles 4 4in any usual or well-known manner by any suitable chucks.

The means I have shown for turning the crank-pins and shaft-bearings areas follows:

30 30 are .carriages mounted upon the ways 2 .of bed 1 for adjustmentalong the same in any well-known manner, or as shown in my said Patent N0. 568,063, and upon each carriage are mounted two cross-slidessimilarly constructed, I and therefore a description of one will applyto both. The pairs of crossslides 31 32 are guided upon thecorresponding carriage in well-known manner, and the cross-slides ofeach pair are fed toward and from each other simultaneously. To this endI have shown the cross feed-screw 33,

provided with right and left hand threads 34- 35, meshing withcorresponding nuts carried by the cross-slides, any suitable well-knownmeans being provided for operating shaft 33. At 3.6 is a shaft runningalong bed 1, and by means of usual or suitable gearing, such as shown insaid Patent No. 568,063, operates the screws 33. A air of frictionsoperated by a shaft 37 in well known manner serves to regulate thefeeding to the cross-slides. Gearing 38 39 40, connecting shaft 36 withspindle 4*, serves to im art proper speed of rotation to shaft 36. Thecross-slides 31 32 are curved on their inner faces, as shown in Figs. 7and 8, to permit the full swing of the crank-arms 20 during the feedingof the crossslide, and said slides also have on one side relativelythinlates or supports 31 32, adapted .to pass eely between the pairsslide of a pair, or instead of an of crank-arms 2-0, so that the lattermay straddle said plates or supports as they rotate.

At 41 is indicated a tool, shown in the form of a mill, having aplurality of cutting edges along its front face and correspondingcutting edges on opposite sides, and the front face of said mill isshown located at an angle with respect to the axis of the crankin orshaft-bearing. (See Fig. 7.) The too 41 is shown carried u on asupporting-block 42, secured to the p ate or support 32 by bolts 43. Ifpreferred, however, a tool having a single cutting edge (indicated at44) may be provided in place of the milling-tool 41. To resisttransverse cutting strains, each cross-- slide may be provided with atool which on one cross-slide should be diametrically opposed to thetool on the corresponding crossextra tool on one cross-slide of a pair arest or abutment may be provided thereon, as indicated at 4:5 46.

Referring to Fig.8, both sets of crossslides are represented, in whichthe pair nearest in view are provided, res ectively, with the tool 41and rest 45, and t 10 cross-slides beyond respectively have the tool 44and rest 46. It will also .be understood that, if desired, eachcross-slide may have two tools arranged at an angle of ninety degrees toeach other, whereby in such case there would be four tools on a pair ofcross-slides, thus presenting resistance to transverse strain, or therecan be an opposed tool and support, as in Fig. 8, on two slides, and on"the same two slides two other opposed tools and supports correspondingto tool 41 and support 45, or tool 44 and support 46. In either casecross feed-threads 34 35 are such that the opposed cross-slides will befed toward each other at absolutely equal speeds, whereby as the stockis cut away by one or more tools the torsional and transverse strainscan be balanced or nearly balanced, so that by having two mills orcutting-tools secured to the two opposed cross-slides and by feedingthem against the work from opposite sides simultaneously rapidity andaccuracy of turning the work can be effected; As I have provided twocarriages, each of which carries two cross-slides constructed andoperating as set forth, four mills or cutting-tools may besimultaneously operating in pairs on any two bearing-surfaces orcrank-pins that are in axial alinement with the center of rotation ofhead-stock spindles 4 and 4. Thus, as both ends of the shaft are drivenand as the work is backed up by a. tool or rest, it is possible toremove twice as much metal by the cutting-tool without increasing thetorsional strain on the crank-shaft, as would be the case with only oneend of the shaft being driven. By operating two or more tools on.

two opposed cross-slides and by having two arms, pins,

pairs of such cross-slides and tools simultaneously operating twocrank-pins or two bearing-surfaces may be simultaneously cut to therequired diameter, and as the mills 41 have cutting edges on the sidesthe inner op posed faces of two crank-arms can be out while 'cutting thecorresponding crank-plns to the required diameter. It will thus beapparent that by means of my improvements I am enabled to quickly,economically, and accurately cut or turn multiple-throw crank andbearings. and this While re quiring but a relatively small amount ofadjustment of the crank-shaft with respect to its supporting-s indles.

The details 0 construction shown and described and the character of thegearing and other well-known mecha 'cal devices used in the lathe may bevaried or used, as deemed desirable, without departing from the spiritof my invention.

Having now described my invention, what I claim is- 1. In a lathe, thecombination of a pair of head-stocks provided with'spindles, means fordriving said spindles at the same speed and in the same direction, meansfor securing the ends of a crank-shaft to said spindles, a pair ofcarriages located between said headstocks, a pair of slides carried byeach car,- ria e, means for simultaneously feeding the slides of eachpair toward each other, and means for securing a cutter or rest to saidslides, substantially as described.

2. In a lathe, the combination of a pair of head-stocks provided withspindles, gearing for operating said spindles at the same speed in thesame direction, means for adjusting one of said head-stocks toward andfrom the other and for coincident-ly adjusting part of said gearing,means for securing the ends of crank-shafts tosaid spindles, a pair ofcarriages located between said head-stocks, a pair of slides carried byeach carriage, means for feeding the slides of each pair toward eachother at the same speed, and means for supporting tools or rests uponsaid slides, substantially as described.

3: In a lathe, the combination of a pair of head-stocks provided withspindles, means for driving said spindles at the same speed and in thesame direction, means for securing the ends of a crank-shaft to saidspindles, a pair of carriages located between said headstocks, a pair ofslides carried by each carriage, means for feeding the' slides of bothpairs simultaneously toward the working point, and means for supportingtools or rests upon such slides, substantially as described.

4. A chuck of the character described comprising a support, a membereccentrically pivotally connected therewith, said member aving means forippin the end of a crank shaft, and means or holding said member m pieceand meansto cause it to grip a crankposition to bring the crank-shaft orits crankpins concentric with the axis of rotation of said support,substantially as described.

5. A chuck of the character described comprising a spindle, a membereccentrically pivotally connected therewith to be rotated thereby, saidmember having a movable shaft, and means for holding said member indifferent positions of adjustment to bring the crank-shaft or itscrank-pin in alinement with the axis of rotation of said spindle,substan tially as described.

6. A chuck of the character described comprising a spindle provided witha hub, a plate removably connected with said hub, a member.eccentrically pivotally connected with said plate, said member beingprovided with means for holding a shaft, and means for l holding saidmember in different positions of adjustment, substantially as described.7. A chuck of the character described comprising a spindle, a supportconnected therewith, a member eccentrically pivotally connected withsaid support, said member having a curved edge, a cap to fit over saidedge, means for clamping said cap upon a shaft, and means for holdingsaid member in different positions of adjustment, substantially asdescribed.

8. In a lathe, the combination of a bed 1 having ways, a head-stockprovided With a l eeaseo stock, whereby the head-stock is kept fromrising from the bed, substantially as described.

9. In a lathe, the combination of a bed provided with ways, adriving-shaft, a headstock, gearing between said shaft and the spindlein the head-stock, a bearing portion receiving said shaft and providedwith guiding-flanges engaging said ways, and means for connecting saidbearing with said headstock, substantially as described.

10. In a lathe, the combination of a pair of head-stocks provided withspindles, means for driving said spindles in the same direction and atthe same speed, means for securing a crank-shaft to said spindles, apair of carriages located between said head-stocks, means for supportinga tool on one carriage on one side of the work, means for supporting atool on the other carriage on the opposite side of the work, and meansfor feeding said tools to the work. I JOHN L. BOGERT. Witnesses: I

T. F. BOURNE, M. HOLLINGSHEAD.

